Fedora/RISC-V: Runnable stage 4 disk images

We’ve now got:

1. An autobuilder.
2. A multithreaded QEMU.
3. A Fedora RPMs repository.
4. A bootable disk image.

It’s unpolished and minimal at the moment, but what you can do today (if you have a Fedora 27+ x86_64 host):

1. Enable the rjones/riscv copr and install riscv-qemu.
2. Download the stage4-disk.img, and bbl and uncompress the disk image.
3. Run this command:

   qemu-system-riscv64 \
       -nographic -machine virt -m 2G -smp 4 \
       -kernel bbl \
       -append "console=ttyS0 ro root=/dev/vda init=/init" \
       -device virtio-blk-device,drive=hd0 \
       -drive file=stage4-disk.img,format=raw,id=hd0 \
       -device virtio-net-device,netdev=usernet \
       -netdev user,id=usernet
   

4. Inside the guest drop a repo file into /etc/yum.repos.d containing:

   [local]
   name=RPMS
   baseurl=https://fedorapeople.org/groups/risc-v/RPMS/
   enabled=1
   gpgcheck=0
   

5. Use tdnf --releasever 27 install ... to install more packages.